Field that stores array of values of the same type. More...

#include <field.h>

Inheritance diagram for Field_typed_array:

Public Member Functions
	Field_typed_array (const Field_typed_array &other)
	Constructs a Field_typed_array that is a copy of another Field_typed_array. More...

	Field_typed_array (enum_field_types elt_type, bool elt_is_unsigned, size_t elt_length, uint elt_decimals, uchar ptr_arg, uchar null_ptr_arg, uint null_bit_arg, uchar auto_flags_arg, const char field_name_arg, TABLE_SHARE share, uint blob_pack_length, const CHARSET_INFO *cs)
	Constructs a Field_typed_array object. More...

uint32	char_length () const override
	maximum possible character length for blob. More...

void	init (TABLE *table_arg) override

enum_field_types	type () const override

enum_field_types	real_type () const override

enum_field_types	binlog_type () const override

uint32	key_length () const override

Field_typed_array *	clone (MEM_ROOT *mem_root) const override
	Create a shallow clone of this field in the specified MEM_ROOT. More...

bool	is_unsigned () const final
	Whether the field is signed or not. More...

bool	is_array () const override
	Whether the field is a typed array. More...

Item_result	result_type () const override

uint	decimals () const override

bool	binary () const override

const CHARSET_INFO *	charset () const override
	Return a text charset so that string functions automatically convert the field value to string and treat it as a non-binary string. More...

type_conversion_status	store (const char to, size_t length, const CHARSET_INFO charset) override
	Store data in this JSON field. More...

type_conversion_status	store (double nr) override
	Store a double in a JSON field. Will raise an error for now. More...

type_conversion_status	store (longlong nr, bool unsigned_val) override
	Store an integer in a JSON field. Will raise an error for now. More...

type_conversion_status	store_array (const Json_wrapper data, Json_array array)
	Store a value as an array. More...

size_t	get_key_image (uchar *buff, size_t length, imagetype type) const override

Field *	new_key_field (MEM_ROOT root, TABLE new_table, uchar new_ptr, uchar , uint) const override

int	key_cmp (const uchar , const uchar ) const override
	These methods are used by handler to prevent returning a row past the end_range during range access. More...

int	key_cmp (const uchar *key_ptr, uint key_length) const override
	This function will behave similarly to MEMBER OF json operation, unlike regular key_cmp. More...

bool	match_collation_to_optimize_range () const override
	Multi-valued index always works only as a pre-filter for actual condition check, and the latter always use binary collation, so no point to match collations in optimizer. More...

bool	coerce_json_value (const Json_wrapper wr, bool no_error, Json_wrapper coerced) const
	Convert arbitrary JSON value to the array's type using the conversion field. More...

const char *	get_index_name () const
	Get name of the index defined over this field. More...

uint32	get_length_bytes () const override
	Return number of bytes the field's length takes. More...

size_t	make_sort_key (uchar *to, size_t max_len) const override
	Writes a copy of the current value in the record buffer, suitable for sorting using byte-by-byte comparison. More...

size_t	make_sort_key (Json_wrapper wr, uchar to, size_t length) const
	Create sort key out of given JSON value according to array's element type. More...

int	do_save_field_metadata (uchar *metadata_ptr) const override
	Save the field metadata for typed array fields. More...

uint	pack_length_from_metadata (uint) const override

void	sql_type (String &str) const final
	Get the type of this field (json). More...

void	make_send_field (Send_field *field) const final
	Populates a Send_field object with metadata about the column represented by this Field object. More...

void	set_field_index (uint16 f_index) final
	Sets field index. More...

Field *	get_conv_field ()

size_t	make_sort_key (uchar *to, size_t length) const override
	Writes a copy of the current value in the record buffer, suitable for sorting using byte-by-byte comparison. More...

size_t	make_sort_key (uchar *buff, size_t length) const override
	Writes a copy of the current value in the record buffer, suitable for sorting using byte-by-byte comparison. More...

size_t	make_sort_key (uchar *to, size_t length, size_t trunc_pos) const final
	Writes a copy of the current value in the record buffer, suitable for sorting using byte-by-byte comparison. More...

Public Member Functions inherited from Field_json
	Field_json (uchar ptr_arg, uchar null_ptr_arg, uint null_bit_arg, uchar auto_flags_arg, const char field_name_arg, TABLE_SHARE share, uint blob_pack_length)

	Field_json (uint32 len_arg, bool is_nullable_arg, const char *field_name_arg)

const CHARSET_INFO *	sort_charset () const final
	Sort should treat the field as binary and not attempt any conversions. More...

bool	has_charset () const final
	JSON columns don't have an associated charset. More...

type_conversion_status	store_decimal (const my_decimal *) final
	Store a decimal in a JSON field. Will raise an error for now. More...

type_conversion_status	store_json (const Json_wrapper *json)
	Store a JSON value as binary. More...

type_conversion_status	store_time (MYSQL_TIME *ltime, uint8 dec_arg) final
	Store a TIME value in a JSON field. Will raise an error for now. More...

type_conversion_status	store (const Field_json *field)
	Copy the contents of a non-null JSON field into this field. More...

bool	pack_diff (uchar **to, ulonglong value_options) const final
	Write the field for the binary log in diff format. More...

longlong	get_diff_vector_and_length (ulonglong value_options, const Json_diff_vector **diff_vector_p=nullptr) const
	Return the length of this field, taking into consideration that it may be in partial format. More...

bool	is_before_image_equal_to_after_image () const
	Return true if the before-image and after-image for this field are equal. More...

bool	unpack_diff (const uchar **from)
	Read the binary diff from the given buffer, and apply it to this field. More...

bool	val_json (Json_wrapper *wr) const
	Retrieve the field's value as a JSON wrapper. More...

longlong	val_int () const final
	Retrieve the JSON as an int if possible. More...

double	val_real () const final
	Retrieve the JSON as a double if possible. More...

String *	val_str (String buf1, String buf2) const final
	Retrieve the JSON value stored in this field as text. More...

my_decimal *	val_decimal (my_decimal *m) const final

bool	get_time (MYSQL_TIME *ltime) const final

bool	get_date (MYSQL_TIME *ltime, my_time_flags_t fuzzydate) const final

uint	is_equal (const Create_field *new_field) const final
	Check if a new field is compatible with this one. More...

Item_result	cast_to_int_type () const final

int	cmp_binary (const uchar a, const uchar b, uint32 max_length=~0L) const final

ulonglong	make_hash_key (ulonglong hash_val) const
	Make a hash key that can be used by sql_executor.cc/unique_hash in order to support SELECT DISTINCT. More...

const char *	get_binary (ptrdiff_t row_offset=0) const
	Get a read-only pointer to the binary representation of the JSON document in this field. More...

Public Member Functions inherited from Field_blob
	Field_blob (uchar ptr_arg, uchar null_ptr_arg, uchar null_bit_arg, uchar auto_flags_arg, const char field_name_arg, TABLE_SHARE share, uint blob_pack_length, const CHARSET_INFO *cs)

	Field_blob (uint32 len_arg, bool is_nullable_arg, const char field_name_arg, const CHARSET_INFO cs, bool set_packlength)

	Field_blob (const Field_blob &field)
	Copy static information and reset dynamic information. More...

	Field_blob (uint32 packlength_arg)

enum ha_base_keytype	key_type () const override

type_conversion_status	store (const Field *from)

int	cmp_max (const uchar , const uchar , uint max_length) const final

int	cmp (const uchar a, const uchar b) const final

int	cmp (const uchar a, uint32 a_length, const uchar b, uint32 b_length) const

uint32	pack_length () const final

uint32	pack_length_no_ptr () const
	Return the packed length without the pointer size added. More...

uint	row_pack_length () const final

uint32	max_data_length () const final
	Get the maximum size of the data in packed format. More...

size_t	get_field_buffer_size ()

void	store_length (uchar *i_ptr, uint i_packlength, uint32 i_number)

void	store_length (uint32 number)

uint32	data_length (ptrdiff_t row_offset=0) const final

uint32	get_length (ptrdiff_t row_offset=0) const

uint32	get_length (const uchar *ptr, uint packlength) const

uint32	get_length (const uchar *ptr_arg) const

const uchar *	get_blob_data () const
	Get a const pointer to the BLOB data of this field. More...

uchar *	get_blob_data (ptrdiff_t row_offset=0)
	Get a non-const pointer to the BLOB data of this field. More...

const uchar *	data_ptr () const final
	Get a const pointer to the BLOB data of this field. More...

void	set_ptr (const uchar length, const uchar data)

void	set_ptr_offset (ptrdiff_t ptr_diff, uint32 length, const uchar *data)

void	set_ptr (uint32 length, const uchar *data)

void	set_key_image (const uchar *buff, size_t length) final

bool	copy ()

uchar *	pack (uchar to, const uchar from, size_t max_length) const final
	Pack the field into a format suitable for storage and transfer. More...

uchar *	pack_with_metadata_bytes (uchar to, const uchar from, uint max_length) const final
	This function does the same thing as pack(), except for the difference that max_length does not mean the number of bytes in the output, but the maximum field length from the input (which must be exactly field->max_field_length()). More...

const uchar *	unpack (uchar , const uchar from, uint param_data) final
	Unpack a blob field from row data. More...

uint	max_packed_col_length () const final
	This is a wrapper around pack_length() used by filesort() to determine how many bytes we need for packing "addon fields". More...

void	mem_free () final

uint32	max_display_length () const final
	maximum possible display length for blob. More...

bool	copy_blob_value (MEM_ROOT *mem_root)
	This function creates a separate copy of blob value. More...

bool	is_text_key_type () const final

void	set_keep_old_value (bool old_value_flag)
	Mark that the BLOB stored in value should be copied before updating it. More...

void	keep_old_value ()
	Save the current BLOB value to avoid that it gets overwritten. More...

void	store_in_allocated_space (const char *from, uint32 length)
	Use to store the blob value into an allocated space. More...

bool	backup_blob_field ()
	Backup data stored in 'value' into the backup_value. More...

void	restore_blob_backup ()
	Restore backup value. More...

Public Member Functions inherited from Field_longstr
	Field_longstr (uchar ptr_arg, uint32 len_arg, uchar null_ptr_arg, uchar null_bit_arg, uchar auto_flags_arg, const char field_name_arg, const CHARSET_INFO charset_arg)

bool	is_updatable () const final
	Checks whether a string field is part of write_set. More...

Public Member Functions inherited from Field_str
	Field_str (uchar ptr_arg, uint32 len_arg, uchar null_ptr_arg, uchar null_bit_arg, uchar auto_flags_arg, const char field_name_arg, const CHARSET_INFO charset)

Item_result	numeric_context_result_type () const final
	Returns Item_result type of a field when it appears in numeric context such as: SELECT time_column + 1; SELECT SUM(time_column); Examples: More...

uint	repertoire () const final

void	set_charset (const CHARSET_INFO *charset_arg)

void	set_field_length (uint32 length) final

enum Derivation	derivation () const final

void	set_derivation (enum Derivation derivation_arg) final

bool	str_needs_quotes () const final

void	add_to_cost (CostOfItem *cost) const override
	Update '*cost' with the fact that this Field is accessed. More...

Public Member Functions inherited from Field
	Field (const Field &)=default

void	operator= (Field &)=delete

bool	has_insert_default_general_value_expression () const
	Checks if the field is marked as having a general expression to generate default values. More...

bool	has_insert_default_datetime_value_expression () const
	Checks if the field is marked as having a datetime value expression to generate default values on inserts. More...

bool	has_update_default_datetime_value_expression () const
	Checks if the field is marked as having a datetime value expression to generate default values on updates. More...

bool	has_insert_default_constant_expression () const
	Checks if the field is marked as having a constant expression to generate default values. More...

uchar *	get_null_ptr ()

bool	is_flag_set (unsigned flag) const

void	set_flag (unsigned flag)

void	clear_flag (unsigned flag)

uint32	all_flags () const

virtual bool	is_wrapper_field () const
	If true, it's a Create_field_wrapper (a sub-class of Field used during CREATE/ALTER that we mustn't cast to other sub-classes of Field that aren't on a direct path of inheritance, e.g. More...

bool	is_gcol () const

bool	is_virtual_gcol () const

void	set_hidden (dd::Column::enum_hidden_type hidden)
	Sets the hidden type for this field. More...

dd::Column::enum_hidden_type	hidden () const

bool	is_hidden () const

bool	is_hidden_by_system () const

bool	is_hidden_by_user () const

bool	is_field_for_functional_index () const

	Field (uchar ptr_arg, uint32 length_arg, uchar null_ptr_arg, uchar null_bit_arg, uchar auto_flags_arg, const char *field_name_arg)
	This is used as a table name when the table structure is not set up. More...

virtual	~Field ()=default

void	reset_warnings ()

void	set_tmp_nullable ()
	Turn on temporary nullability for the field. More...

void	reset_tmp_nullable ()
	Turn off temporary nullability for the field. More...

void	reset_tmp_null ()
	Reset temporary NULL value for field. More...

void	set_tmp_null ()
	Set field to temporary value NULL. More...

bool	is_tmp_nullable () const

bool	is_tmp_null () const

virtual type_conversion_status	store_packed (longlong nr)
	Store a temporal value in packed longlong format into a field. More...

type_conversion_status	store_time (MYSQL_TIME *ltime)
	Store MYSQL_TYPE value into a field when the number of fractional digits is not important or is not know. More...

type_conversion_status	store (const char to, size_t length, const CHARSET_INFO cs, enum_check_fields check_level)

virtual longlong	val_time_temporal () const
	Returns TIME value in packed longlong format. More...

virtual longlong	val_date_temporal () const
	Returns DATE/DATETIME value in packed longlong format. More...

virtual longlong	val_time_temporal_at_utc () const

virtual longlong	val_date_temporal_at_utc () const

longlong	val_temporal_by_field_type () const
	Returns "native" packed longlong representation of a TIME or DATE/DATETIME field depending on field type. More...

String *	val_str (String *str) const

String *	val_int_as_str (String *val_buffer, bool unsigned_flag) const
	Interpret field value as an integer but return the result as a string. More...

virtual Item_result	cmp_type () const

bool	gcol_expr_is_equal (const Create_field *field) const
	Check whether generated columns' expressions are the same. More...

virtual bool	eq (const Field *field) const

virtual bool	eq_def (const Field *field) const

virtual uint32	pack_length_in_rec () const

virtual bool	compatible_field_size (uint metadata, Relay_log_info , uint16, int order) const
	Check to see if field size is compatible with destination. More...

int	save_field_metadata (uchar *first_byte)

virtual type_conversion_status	reset ()

virtual bool	get_timestamp (my_timeval tm, int warnings) const
	Returns a UTC component in `struct timeval` format. More...

virtual void	store_timestamp (const my_timeval *)
	Stores a timestamp value in timeval format in a field. More...

virtual void	set_default ()

void	evaluate_insert_default_function ()
	Evaluates the `INSERT` default function and stores the result in the field. More...

void	evaluate_update_default_function ()
	Evaluates the `UPDATE` default function, if one exists, and stores the result in the record buffer. More...

virtual bool	zero_pack () const

int	cmp (const uchar *str) const

virtual int	cmp_offset (ptrdiff_t row_offset) const

virtual int	cmp_binary_offset (ptrdiff_t row_offset) const

bool	is_null (ptrdiff_t row_offset=0) const
	Check whether the full table's row is NULL or the Field has value NULL. More...

bool	is_real_null (ptrdiff_t row_offset=0) const
	Check whether the Field has value NULL (temporary or actual). More...

bool	is_null_in_record (const uchar *record) const
	Check if the Field has value NULL or the record specified by argument has value NULL for this Field. More...

void	set_null (ptrdiff_t row_offset=0)
	Set field to value NULL. More...

void	set_notnull (ptrdiff_t row_offset=0)
	Set field to value NOT NULL. More...

type_conversion_status	check_constraints (int mysql_errno)
	Check NOT NULL constraint on the field after temporary nullability is disabled. More...

void	set_check_for_truncated_fields (enum_check_fields check_for_truncated_fields)
	Remember the value of THD::check_for_truncated_fields to handle possible NOT-NULL constraint errors after BEFORE-trigger execution is finished. More...

bool	is_nullable () const

uint	null_offset (const uchar *record) const

uint	null_offset () const

void	set_null_ptr (uchar *p_null_ptr, uint p_null_bit)

virtual bool	optimize_range (uint idx, uint part) const
	Whether this field can be used for index range scans when in the given keypart of the given index. More...

virtual bool	can_be_compared_as_longlong () const

virtual Field *	new_field (MEM_ROOT root, TABLE new_table) const

Field *	new_field (MEM_ROOT root, TABLE new_table, uchar new_ptr, uchar new_null_ptr, uint new_null_bit) const

Field *	new_key_field (MEM_ROOT root, TABLE new_table, uchar *new_ptr) const

void	move_field (uchar ptr_arg, uchar null_ptr_arg, uchar null_bit_arg)

virtual void	move_field_offset (ptrdiff_t ptr_diff)

virtual void	get_image (uchar buff, size_t length, const CHARSET_INFO ) const

virtual void	set_image (const uchar buff, size_t length, const CHARSET_INFO )

longlong	val_int_offset (ptrdiff_t row_offset)

longlong	val_int (uchar *new_ptr)

String *	val_str (String str, uchar new_ptr)

virtual bool	send_to_protocol (Protocol *protocol) const
	Send the value of this field over the protocol using the correct Protocol::store*() function which matches the type of the field. More...

uchar *	pack (uchar *to) const

const uchar *	unpack (const uchar *from)

uint	offset (uchar *record) const

void	copy_data (ptrdiff_t src_record_offset)

const CHARSET_INFO *	charset_for_protocol () const

bool	set_warning (Sql_condition::enum_severity_level level, unsigned int code, int cut_increment)
	Produce warning or note about data saved into field. More...

bool	set_warning (Sql_condition::enum_severity_level level, uint code, int cut_increment, const char view_db, const char view_name)
	Produce warning or note about data saved into field. More...

bool	warn_if_overflow (int op_result)
	Process decimal library return codes and issue warnings for overflow and truncation. More...

longlong	convert_decimal2longlong (const my_decimal val, bool unsigned_flag, bool has_overflow)
	Conversion from decimal to longlong. More...

virtual geometry_type	get_geometry_type () const

void	dbug_print () const

ha_storage_media	field_storage_type () const

void	set_storage_type (ha_storage_media storage_type_arg)

column_format_type	column_format () const

void	set_column_format (column_format_type column_format_arg)

virtual type_conversion_status	validate_stored_val (THD *thd)

virtual void	hash (ulong nr, ulong nr2) const

virtual ulonglong	get_max_int_value () const
	Get the upper limit of the MySQL integral and floating-point type. More...

const uchar *	field_ptr () const
	Return a const pointer to where the field is stored in the record buffer. More...

uchar *	field_ptr ()
	Return a pointer to where the field is stored in the record buffer. More...

void	set_field_ptr (uchar *ptr_arg)

bool	is_part_of_actual_key (THD thd, uint cur_index, KEY cur_index_info) const
	Check whether field is part of the index taking the index extensions flag into account. More...

Key_map	get_covering_prefix_keys () const
	Get covering prefix keys. More...

bool	handle_old_value () const
	Whether field's old valued have to be handled. More...

uint16	field_index () const
	Returns field index. More...

Private Attributes
Item_field *	m_conv_item {nullptr}
	Conversion item_field. More...

enum_field_types	m_elt_type
	The array element's real type. More...

uint	m_elt_decimals
	Element's decimals. More...

const CHARSET_INFO *	m_elt_charset
	Element's charset. More...

const bool	unsigned_flag

Additional Inherited Members
Public Types inherited from Field
enum	enum_auto_flags { NONE = 0 , NEXT_NUMBER = 1 , DEFAULT_NOW = 2 , ON_UPDATE_NOW = 4 , GENERATED_FROM_EXPRESSION = 8 }
	Flags for Field::auto_flags / Create_field::auto_flags bitmaps. More...

enum	geometry_type { GEOM_GEOMETRY = 0 , GEOM_POINT = 1 , GEOM_LINESTRING = 2 , GEOM_POLYGON = 3 , GEOM_MULTIPOINT = 4 , GEOM_MULTILINESTRING = 5 , GEOM_MULTIPOLYGON = 6 , GEOM_GEOMETRYCOLLECTION = 7 }

enum	imagetype { itRAW , itMBR }

Static Public Member Functions inherited from Field
static bool	type_can_have_key_part (enum_field_types)
	Check whether a field type can be partially indexed by a key. More...

static enum_field_types	field_type_merge (enum_field_types, enum_field_types)
	Return type of which can carry value of both given types in UNION result. More...

static Item_result	result_merge_type (enum_field_types)
	Detect Item_result by given field type of UNION merge result. More...

Public Attributes inherited from Field_str
uint32	char_length_cache

Public Attributes inherited from Field
TABLE *	table
	Pointer to TABLE object that owns this field. More...

const char *	orig_db_name {nullptr}
	Pointer to original database name, only non-NULL for a temporary table. More...

const char *	orig_table_name {nullptr}
	Pointer to original table name, only non-NULL for a temporary table. More...

const char **	table_name

const char *	field_name

LEX_CSTRING	comment

Key_map	key_start

Key_map	part_of_key
	Keys that includes this field except of prefix keys. More...

Key_map	part_of_prefixkey
	Prefix keys. More...

Key_map	part_of_sortkey

Key_map	part_of_key_not_extended
	All keys that include this field, but not extended by the storage engine to include primary key columns. More...

uint32	field_length

uchar	null_bit

uchar	auto_flags
	Bitmap of flags indicating if field value is auto-generated by default and/or on update, and in which way. More...

bool	is_created_from_null_item
	If true, this field was created in create_tmp_field_from_item from a NULL value. More...

bool	m_indexed
	True if this field belongs to some index (unlike part_of_key, the index might have only a prefix). More...

LEX_CSTRING	m_engine_attribute = EMPTY_CSTR

LEX_CSTRING	m_secondary_engine_attribute = EMPTY_CSTR

Value_generator *	gcol_info {nullptr}

bool	stored_in_db
	Indication that the field is physically stored in tables rather than just generated on SQL queries. More...

Value_generator *	m_default_val_expr {nullptr}
	Holds the expression to be used to generate default values. More...

Static Public Attributes inherited from Field
static constexpr size_t	MAX_VARCHAR_WIDTH {65535}

static constexpr size_t	MAX_TINY_BLOB_WIDTH {255}

static constexpr size_t	MAX_SHORT_BLOB_WIDTH {65535}

static constexpr size_t	MAX_MEDIUM_BLOB_WIDTH {16777215}

static constexpr size_t	MAX_LONG_BLOB_WIDTH {4294967295}

Protected Member Functions inherited from Field_blob
void	store_ptr_and_length (const char *from, uint32 length)
	Store ptr and length. More...

Protected Member Functions inherited from Field_longstr
type_conversion_status	check_string_copy_error (const char well_formed_error_pos, const char cannot_convert_error_pos, const char from_end_pos, const char end, bool count_spaces, const CHARSET_INFO *cs)
	Report "not well formed" or "cannot convert" error after storing a character string info a field. More...

Protected Member Functions inherited from Field
uchar *	pack_int16 (uchar to, const uchar from, size_t max_length) const

const uchar *	unpack_int16 (uchar to, const uchar from) const

uchar *	pack_int24 (uchar to, const uchar from, size_t max_length) const

const uchar *	unpack_int24 (uchar to, const uchar from) const

uchar *	pack_int32 (uchar to, const uchar from, size_t max_length) const

const uchar *	unpack_int32 (uchar to, const uchar from) const

uchar *	pack_int64 (uchar to, const uchar from, size_t max_length) const

const uchar *	unpack_int64 (uchar to, const uchar from) const

Static Protected Member Functions inherited from Field_blob
static uchar *	get_blob_data (const uchar *position)
	Get the BLOB data pointer stored at the specified position in the record buffer. More...

Protected Attributes inherited from Field_blob
uint	packlength
	The number of bytes used to represent the length of the blob. More...

String	value
	The 'value'-object is a cache fronting the storage engine. More...

Protected Attributes inherited from Field_str
const CHARSET_INFO *	field_charset

enum Derivation	field_derivation

Protected Attributes inherited from Field
uchar *	ptr
	Holds the position to the field in record. More...

Static Protected Attributes inherited from Field
static uchar	dummy_null_buffer = ' '

Detailed Description

Field that stores array of values of the same type.

This Field class is used together with Item_func_array_cast class (CAST( .. AS .. ARRAY) function) in implementation of multi-valued index. Effectively it's a JSON field that contains a single JSON array. When a JSON value is stored, it's checked to be either a scalar, or an array. All source values are converted using the internal conversion field and stored as an array. Field_typed_array ensures that all values stored in the array have the same type and precision - the one specified by user. This way InnoDB doesn't have to do the conversion on its own and can easily index them.

The Field_typed_array always reports type of its element and from this point of view it's undistinguishable from regular field having the same type. Due to that, fields are differentiated by is_array() property. Field_typed_array returns true, all other fields - false.

For conversion and index applicability tests, Field_typed_array employs a conversion field, which is a regular Field class of array's element type. It's stored in the m_conv_field. All Field_typed_array::store_*() methods store values to the conversion field. Conversion field and typed array field are sharing same field_index, to allow correct read/write_set checks. So the field always have to be marked for read in order to allow read of conversions' results.

See also: Item_func_array_cast

Constructor & Destructor Documentation

◆ Field_typed_array() [1/2]

Field_typed_array::Field_typed_array ( const Field_typed_array & other )

Constructs a Field_typed_array that is a copy of another Field_typed_array.

Parameters

other the other Field_typed_array object

◆ Field_typed_array() [2/2]

Field_typed_array::Field_typed_array	(	enum_field_types	elt_type,
		bool	elt_is_unsigned,
		size_t	elt_length,
		uint	elt_decimals,
		uchar *	ptr_arg,
		uchar *	null_ptr_arg,
		uint	null_bit_arg,
		uchar	auto_flags_arg,
		const char *	field_name_arg,
		TABLE_SHARE *	share,
		uint	blob_pack_length,
		const CHARSET_INFO *	cs
	)

Constructs a Field_typed_array object.

Member Function Documentation

◆ binary()

bool Field_typed_array::binary ( ) const

inlineoverridevirtual

Reimplemented from Field_str.

◆ binlog_type()

enum_field_types Field_typed_array::binlog_type ( ) const

inlineoverridevirtual

Reimplemented from Field.

◆ char_length()

uint32 Field_typed_array::char_length ( ) const

inlineoverridevirtual

maximum possible character length for blob.

This method is used in Item_field::set_field to calculate max_length for Item.

For example: CREATE TABLE t2 SELECT CONCAT(tinyblob_utf8_column) FROM t1; must create a "VARCHAR(255) CHARACTER SET utf8" column.

Returns: length

Reimplemented from Field_blob.

◆ charset()

const CHARSET_INFO * Field_typed_array::charset ( ) const

inlineoverridevirtual

Return a text charset so that string functions automatically convert the field value to string and treat it as a non-binary string.

Reimplemented from Field_json.

◆ clone()

Field_typed_array * Field_typed_array::clone ( MEM_ROOT * mem_root ) const

overridevirtual

Create a shallow clone of this field in the specified MEM_ROOT.

Reimplemented from Field_json.

◆ coerce_json_value()

bool Field_typed_array::coerce_json_value	(	const Json_wrapper *	wr,
		bool	no_error,
		Json_wrapper *	coerced
	)		const

Convert arbitrary JSON value to the array's type using the conversion field.

If conversion fails and it's not a coercion test (no_error= false) then an error is thrown. The converted value is guaranteed to match the field's type and can be indexed by SE without any additional handling.

Parameters

[in]	wr	Source data
[in]	no_error	Whether an error should be thrown if value can't be coerced. Error should be thrown when inserting data into the index, and shouldn't be thrown when the range optimizer tests index applicability.
[out]	coerced	The converted value. Can be nullptr if no_error is true.

Returns: true conversion failed false conversion succeeded

◆ decimals()

uint Field_typed_array::decimals ( ) const

inlineoverridevirtual

Reimplemented from Field_str.

◆ do_save_field_metadata()

int Field_typed_array::do_save_field_metadata ( uchar * metadata_ptr ) const

overridevirtual

Save the field metadata for typed array fields.

Saved metadata contains element type (1 byte) and up to 3 bytes of metadata - the same as each respective Field class saves (e.g Field_new_decimal for DECIMAL type). The only difference is that for VARCHAR type length is stored in 3 bytes. This allows to store longer strings, as its supported by JSON storage.

Parameters

metadata_ptr First byte of field metadata

Returns: number of bytes written to metadata_ptr

Reimplemented from Field_blob.

◆ get_conv_field()

Field * Field_typed_array::get_conv_field ( )

◆ get_index_name()

const char * Field_typed_array::get_index_name ( ) const

Get name of the index defined over this field.

Since typed array fields can be created only as an underlying GC field of a multi-valued functional index, there's always only one index defined over the field.

Returns: name of the index defined over the field.

◆ get_key_image()

size_t Field_typed_array::get_key_image	(	uchar *	buff,
		size_t	length,
		imagetype	type
	)		const

overridevirtual

Reimplemented from Field_blob.

◆ get_length_bytes()

uint32 Field_typed_array::get_length_bytes ( ) const

inlineoverridevirtual

Return number of bytes the field's length takes.

Valid only for varchar and typed arrays of varchar

Reimplemented from Field.

◆ init()

void Field_typed_array::init ( TABLE * table_arg )

overridevirtual

Reimplemented from Field.

◆ is_array()

bool Field_typed_array::is_array ( ) const

inlineoverridevirtual

Whether the field is a typed array.

Reimplemented from Field.

◆ is_unsigned()

bool Field_typed_array::is_unsigned ( ) const

inlinefinalvirtual

Whether the field is signed or not.

Meaningful only for numeric fields and numeric arrays.

Reimplemented from Field.

◆ key_cmp() [1/2]

int Field_typed_array::key_cmp	(	const uchar *	,
		const uchar *
	)		const

inlineoverridevirtual

These methods are used by handler to prevent returning a row past the end_range during range access.

Since there's no order defined for sorting set of arrays, always return -1 here, allowing all records fetched from SE to be returned to server. They will be filtered by WHERE condition later.

Reimplemented from Field_blob.

◆ key_cmp() [2/2]

int Field_typed_array::key_cmp	(	const uchar *	key_ptr,
		uint	key_length
	)		const

overridevirtual

This function will behave similarly to MEMBER OF json operation, unlike regular key_cmp.

The key value will be checked against members of the array and the presence of the key will be considered as the record matching the given key. This particular definition is used in descending ref index scans. Descending index scan uses handler::ha_index_prev() function to read from the storage engine which does not compare the index key with the search key [unlike handler::ha_index_next_same()]. Hence each retrieved record needs to be validated to find a stop point. Refer key_cmp_if_same() and RefIterator<true>::Read() for more details.

Parameters

key_ptr	Pointer to the key
key_length	Key length

Returns: 0 Key found in the record -1 Key not found in the record

Reimplemented from Field_blob.

◆ key_length()

uint32 Field_typed_array::key_length ( ) const

overridevirtual

Reimplemented from Field_blob.

◆ make_send_field()

void Field_typed_array::make_send_field ( Send_field * send_field ) const

finalvirtual

Populates a Send_field object with metadata about the column represented by this Field object.

The Send_field object is used for sending column metadata to the client.

Parameters

[out] send_field the Send_field object to populate

Reimplemented from Field_str.

◆ make_sort_key() [1/5]

size_t Field_typed_array::make_sort_key	(	Json_wrapper *	wr,
		uchar *	to,
		size_t	length
	)		const

Create sort key out of given JSON value according to array's element type.

Parameters

wr	JSON value to create sort key from
to	buffer to create sort key in
length	buffer's length

Returns: actual sort key length

◆ make_sort_key() [2/5]

size_t Field_blob::make_sort_key	(	uchar *	buff,
		size_t	length
	)		const

overridevirtual

Writes a copy of the current value in the record buffer, suitable for sorting using byte-by-byte comparison.

Integers are always in big-endian regardless of hardware architecture. At most length bytes are written into the buffer.

Parameters

buff	The buffer, assumed to be at least length bytes.
length	Number of bytes to write.

Return values

The	number of bytes actually written.

Note: This is now only used by replication; filesort makes its own sort keys based off of Items, not Fields.

Reimplemented from Field_json.

◆ make_sort_key() [3/5]

size_t Field_json::make_sort_key	(	uchar *	buff,
		size_t	length
	)		const

overridevirtual

Writes a copy of the current value in the record buffer, suitable for sorting using byte-by-byte comparison.

Integers are always in big-endian regardless of hardware architecture. At most length bytes are written into the buffer.

Parameters

buff	The buffer, assumed to be at least length bytes.
length	Number of bytes to write.

Return values

The	number of bytes actually written.

Note: This is now only used by replication; filesort makes its own sort keys based off of Items, not Fields.

Reimplemented from Field_json.

◆ make_sort_key() [4/5]

size_t Field_blob::make_sort_key	(	uchar *	buff,
		size_t	length,
		size_t	trunc_pos
	)		const

finalvirtual

Writes a copy of the current value in the record buffer, suitable for sorting using byte-by-byte comparison.

Integers are always in big-endian regardless of hardware architecture. At most length bytes are written into the buffer. Field_string, Field_varstring and Field_blob classes are truncated after pos number of characters.

Parameters

buff	The buffer, assumed to be at least length bytes.
length	Number of bytes to write.
trunc_pos	Number of characters which should be included before truncation.

Return values

The	number of bytes actually written.

Note: This is now only used by replication; filesort makes its own sort keys based off of Items, not Fields.

Reimplemented from Field_json.

◆ make_sort_key() [5/5]

size_t Field_typed_array::make_sort_key	(	uchar *	buff,
		size_t	length
	)		const

inlineoverridevirtual

Writes a copy of the current value in the record buffer, suitable for sorting using byte-by-byte comparison.

Integers are always in big-endian regardless of hardware architecture. At most length bytes are written into the buffer.

Parameters

buff	The buffer, assumed to be at least length bytes.
length	Number of bytes to write.

Return values

The	number of bytes actually written.

Note: This is now only used by replication; filesort makes its own sort keys based off of Items, not Fields.

Reimplemented from Field_json.

◆ match_collation_to_optimize_range()

bool Field_typed_array::match_collation_to_optimize_range ( ) const

inlineoverridevirtual

Multi-valued index always works only as a pre-filter for actual condition check, and the latter always use binary collation, so no point to match collations in optimizer.

Reimplemented from Field_blob.

◆ new_key_field()

Field * Field_typed_array::new_key_field	(	MEM_ROOT *	root,
		TABLE *	new_table,
		uchar *	new_ptr,
		uchar *	,
		uint
	)		const

overridevirtual

Reimplemented from Field.

◆ pack_length_from_metadata()

uint Field_typed_array::pack_length_from_metadata ( uint ) const

inlineoverridevirtual

Reimplemented from Field.

◆ real_type()

enum_field_types Field_typed_array::real_type ( ) const

inlineoverridevirtual

Reimplemented from Field.

◆ result_type()

Item_result Field_typed_array::result_type ( ) const

overridevirtual

Reimplemented from Field_str.

◆ set_field_index()

void Field_typed_array::set_field_index ( uint16 field_index )

finalvirtual

Sets field index.

Parameters

[in] field_index Field index.

Reimplemented from Field.

◆ sql_type()

void Field_typed_array::sql_type ( String & str ) const

finalvirtual

Get the type of this field (json).

Parameters

str	the string that receives the type

Reimplemented from Field_json.

◆ store() [1/3]

type_conversion_status Field_typed_array::store	(	const char *	from,
		size_t	length,
		const CHARSET_INFO *	cs
	)

overridevirtual

Store data in this JSON field.

JSON data is usually stored using store(Field_json*) or store_json(), so this function will only be called if non-JSON data is attempted stored in a JSON field. This results in an error in most cases.

It will attempt to parse the string (unless it's binary) as JSON text, and store a binary representation of JSON document if the string could be parsed.

Note that we override store() and not store_internal() because Field_blob::store() contains logic that bypasses store_internal() in some cases we care about. In particular:

When supplied an empty string, we want to raise a JSON syntax error instead of silently inserting an empty byte string.
When called from GROUP_CONCAT with ORDER BY or DISTINCT, we want to do the same data conversion as usual, whereas Field_blob::store() jumps directly to Field_blob::store_to_mem() with the unprocessed input data.

Parameters

from	the start of the data to be stored
length	the length of the data
cs	the character set of the data

Returns: zero on success, non-zero on failure

Reimplemented from Field_json.

◆ store() [2/3]

type_conversion_status Field_typed_array::store ( double nr )

overridevirtual

Store a double in a JSON field. Will raise an error for now.

Reimplemented from Field_json.

◆ store() [3/3]

type_conversion_status Field_typed_array::store	(	longlong	nr,
		bool	unsigned_val
	)

overridevirtual

Store an integer in a JSON field. Will raise an error for now.

Reimplemented from Field_json.

◆ store_array()

type_conversion_status Field_typed_array::store_array	(	const Json_wrapper *	data,
		Json_array *	array
	)

Store a value as an array.

Parameters

data	the value to store as an array
array	scratch space for building the array to store

Returns: the status of the operation

◆ type()

enum_field_types Field_typed_array::type ( ) const

inlineoverridevirtual

Reimplemented from Field_json.

Member Data Documentation

◆ m_conv_item

Item_field* Field_typed_array::m_conv_item {nullptr}

private

Conversion item_field.

◆ m_elt_charset

const CHARSET_INFO* Field_typed_array::m_elt_charset

private

Element's charset.

◆ m_elt_decimals

uint Field_typed_array::m_elt_decimals

private

Element's decimals.

◆ m_elt_type

enum_field_types Field_typed_array::m_elt_type

private

The array element's real type.

◆ unsigned_flag

const bool Field_typed_array::unsigned_flag

private

The documentation for this class was generated from the following files:

Public Member Functions

Private Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ Field_typed_array() [1/2]

◆ Field_typed_array() [2/2]

Member Function Documentation

◆ binary()

◆ binlog_type()

◆ char_length()

◆ charset()

◆ clone()

◆ coerce_json_value()

◆ decimals()

◆ do_save_field_metadata()

◆ get_conv_field()

◆ get_index_name()

◆ get_key_image()

◆ get_length_bytes()

◆ init()

◆ is_array()

◆ is_unsigned()

◆ key_cmp() [1/2]

◆ key_cmp() [2/2]

◆ key_length()

◆ make_send_field()

◆ make_sort_key() [1/5]

◆ make_sort_key() [2/5]

◆ make_sort_key() [3/5]

◆ make_sort_key() [4/5]

◆ make_sort_key() [5/5]

◆ match_collation_to_optimize_range()

◆ new_key_field()

◆ pack_length_from_metadata()

◆ real_type()

◆ result_type()

◆ set_field_index()

◆ sql_type()

◆ store() [1/3]

◆ store() [2/3]

◆ store() [3/3]

◆ store_array()

◆ type()

Member Data Documentation

◆ m_conv_item

◆ m_elt_charset

◆ m_elt_decimals

◆ m_elt_type

◆ unsigned_flag